Horn for talking machines



Patented Nov. 22, 1927.

UNITED STATES PATENT OFFICE.

HUGO WU NSCH, OF BERLIN, GERMANY, ASSIGNOR TO POLYPHONWERKE AKTIEN- GESELLSCHAFT, OF BERLIN, GERMANY, A CORPORATION OF GERMANY.

HORN FOR TALKING MACHINES.

No Drawing. Application filed November 12, 1925, Serial No. 68,730, and in Denmark December 30, 1924.

This invention refers to horns for talking machines. The essential feature of the in vention consists in the fact that the horn Which in known manner is made of Wood is impregnated With a mixture which consists of a silicate and compounds of alkali metals and alkaline earth metals.

The horn constructed according to the invention has the advantage that it produces a very fine full tone, which is better, purer and fuller than in the case of an ordinary Wood horn. elliptical cross section.

In producing horns the best procedure is to spray the Wood with an aqueous solution of the aforesaid mixture by means of compressed air or carbonic acid.

The mixture may conveniently be composed as follows: 4 parts (by Weight) of Portland cement, 4: parts of lime, 4: parts of Preferably the horn has an plaster of Paris, 1 part of common salt, 1 part of soluble glass (sodium silicate.)

' That I claim is:

1. A horn of Wood for talking machines, said horn being impregnated With a mixture consisting of a silicate and compounds of alkali metals and alkaline earth metals.

2. A horn of Wood for talking machines, said 'horn being impregnated With an aqueous solution of Portland cement, lime, plaster, common salt and soluble glass.

3. A horn of WOOCl for talking machines, said horn being impregnated with an aqueous solution of 4 parts (by Weight) of Portland cement, at parts of lime, 4 parts of plaster, 1 part of common salt and 1 part of soluble glass.

In testimony whereof I have aiiixcd my HUGO, WUNSGH,

signature, 

